private void cmbUserName_SelectionChangeCommitted(object sender, EventArgs e)
        {
            cmbCustomerName.Text         = "";
            Classes.PubClass.CompanyName = "";

            if (cmbUserName.SelectedIndex > -1)
            {
                Classes.PubClass.UserId = (long)cmbUserName.SelectedValue;
                CustomerNameList mForm = new CustomerNameList();
                mForm.ShowDialog();
            }

            if (Classes.PubClass.CompanyName != "")
            {
                cmbCustomerName.Text = Classes.PubClass.CompanyName;
                var table = new T_CustomersTableAdapter().GetDataById((long)Classes.PubClass.CompanyId);
                if (table.Rows.Count > 0)
                {
                    if (((销售管理.DAL.DataSetCustomers.T_CustomersRow)table.Rows[0]).IsCityIDNull() == true)
                    {
                        MessageBox.Show("请先设置该客户所在地区");
                        btnSave.Enabled = false;
                    }
                    else
                    {
                        btnSave.Enabled = true;
                    }
                    CityId = ((销售管理.DAL.DataSetCustomers.T_CustomersRow)table.Rows[0]).IsCityIDNull() == true ? -1 : ((销售管理.DAL.DataSetCustomers.T_CustomersRow)table.Rows[0]).CityID;
                }
                else
                {
                    CityId = -1;
                }
            }
        }
        private void cmbUserName_SelectionChangeCommitted(object sender, EventArgs e)
        {
            Classes.PubClass.CompanyName = "";

            if (cmbUserName.SelectedIndex > -1)
            {
                Classes.PubClass.UserId = (long)cmbUserName.SelectedValue;
                CustomerNameList mForm = new CustomerNameList();
                mForm.ShowDialog();
            }
        }